If I'm using latest build of SQLAnywhere 16 than how to know which version of TLS where used in communication. I also wanted to assure that it will not downgrade to lesser version and will not use lesser than 1.1 version.
There are no settings to change the version of TLS used by SQL Anywhere. However, all TLS applications will use the highest level of TLS supported by both sides. All SQL Anywhere versions starting with version 12 support TLS 1.2, and so a SQL Anywhere version 16 server will use TLS 1.2 as long as the client is from SQL Anywhere version 12 or later.